Controller for compressor driven by induction motor

Details Controller for compressor driven by induction motor Controller for compressor driven by induction motor

1991-05-28

1993-05-25

Shoop, Jr., William M.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318805, H02P 540

Patent

active

052143678

ABSTRACT:
A d.c. input current to a variable-voltage, variable-frequency inverter is detected, the inverter variable-speed driving a compressor which has a load torque changing with the rotary position and driven by an induction motor. The detected d.c. input current is sampled in synchronization with the timing, when the inductive load components of a current flowing through the induction motor become null. The sampled current value is output as a slip signal of the induction motor. A compensated d.c. voltage command is derived from the slip signal, and the input voltage to the inverter is regulated in acccrdance with the compensated d.c. voltage command.

REFERENCES:
patent: 4215305 (1980-07-01), D'Atre et al.
patent: 4490666 (1984-12-01), Tanamachi et al.
patent: 4734634 (1988-03-01), Kito et al.
patent: 4745991 (1988-05-01), Tanahashi
patent: 4763058 (1988-08-01), Heining et al.
patent: 4879502 (1989-11-01), Endo et al.
patent: 5015153 (1991-05-01), Uesugi et al.

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